Under the spreading chestnut tree
The village smithy stands;
The smith, a mighty man is he,
With large and sinewy hands;
And the muscles of his brawny arms
Are strong as iron bands.
Henry Wadsworth Longfellow, from "The Village Blacksmith"
The farrier came this week to trim and balance Black Jack's feet. For horse-owners, feet loom large, and the farrier is an important person. Horses can die if their feet aren't properly cared for. They are susceptible to infections, both fungal and bacterial, and horse-lovers have nightmares about hearing the dreaded word "laminitis," an inflammation/infection of the hoof wall that can and does kill horses (this is what did in poor Barbaro). So the farrier, the person who comes periodically to trim, balance, and sometimes shoe horses, is a vital ally in keeping a horse in good health.
A clarification: "blacksmith" and "farrier" are related, but not interchangeable, terms. A blacksmith is a person who forges all manner of iron implements, including horseshoes; a farrier is an expert in hoof-care, who also fits, fabricates, and puts shoes on a horse. In Longfellow's day, when everyone had horses, these duties almost always overlapped, so the blacksmith and the farrier were the same person. Nowadays, while a farrier is always a blacksmith, a blacksmith isn't always a farrier.